Why does the Torah say that Aharon returned to Moshe?
Moshav Zekenim (citing R. Yehudah ha'Chasid): He told him that the plague had ceased, and Moshe stopped Davening. 1
Moshav Zekenim (Ibid.)": We learn from here that, if a Choleh for whom one is Dacvenning recovers, one, should stop Davenning. That being the case, how can Rashi in Yisro Sh'mos, 19:8, citing the Pesikta, learn from here that it is proper for a Shali'ach to return to the Meshale'ach, even if the latter knows what happened? Perhaps here it is superfluous to teach us that one stops Davening (PF).